Experimental and research on underwater image transmission based on semiconductor laser

In this work, we designed a full-duplex wireless optical communication system based on underwater semiconductor laser alignment and image transmission. For various underwater operations such as seabed exploration, underwater platform defense, and deep-sea resource exploration, underwater wireless optical communication (UWOC) technology has unique advantages due to its high data transmission rate and low latency. The system's transmitter uses blue-green semiconductor lasers with powers of 5Wand wavelengths of 445nm and 520nm. The receiver utilizes a wide-field fisheye lens and a high-sensitivity laser detector, employing OOK modulation at a pulse signal transmission rate of 2Mbps to achieve low bit error rate (BER)high-resolution video transmission. Additionally, the system uses a high-definition optical imaging CCD camera and a laser array for alignment simulation experiments, significantly improving the probability of mutual alignment in duplex underwater laser communication by using high-definition optical imaging modules to capture near-field underwater images.